borland



2 Sheets-Sheet 1.

(No Model.)

F J BORLAND ELECTRIC ARC LAMP.

No. 552,982. Patented Jan. 14, 1896.

2 shets-sneen 2. v

(No Model.)

' P J BORLAND ELECTRIC ARC LAMP.

No. 552,982. Patented Jan. 14, 1896.

NJQE.

UNITED STATES PATENT OFFICE.

FREDERICK J. BORLAND, OF LEEDS, ENGLAND.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 552,982, dated January 14, 1896.

Application filed August 17, 1894. Serial No. 520,605. (No model.)

T all whom, it may concern:

Be it known that I, FREDERICK JOHN BOR- LAND, a subject of the Queen of Great Britain, residing at Leeds, in the county of York, England, have invented certain new and useful Improvements in Electric-Arc Lamps, (for which I have obtained a patent in Great Britain, No.18,115, dated June 27,1893,) of which the following is a specification.

My invention consists of certain improve ments in electric-arc lamps, such being specially applicable for projecting purposes.

In the drawings, Figure 1 is a side elevation of an arc lamp according to my invention. Fig. 2 is a plan of Fig.1. Fig. 3 is a detail sectional elevation of the core shown in Figs. 1. and 2.

According to my invention I employ shunt and series coils or solenoids A and B mounted or wound on a tube or hollow spindle B which is supported by the framework E, (serving for the support of lamp and bearings for levers.) The central spindle 13 is closed at one or both ends by means of stoppers A and B, thereby forming a cylinder or cylinders. orking within the said tube or hollow spindle B is a central core C which acts as a piston in a cylinder and forms a dash-pot.

On the framework E are pivoted arms or levers F and G by means of axles F and G. One of the levers or arms (in this case G) passes through a slot in the said tube or hollow spindle and is slotted at G and joined to the central core 0 by means of a pin 0 passing through the said core, which is slotted to receive the said lever G. The said central core C may be provided with annular rings or grooves 11 to make it more air-tight with the tube or hollow spindle B The lower carbon lever or arm G has a wheel or toothed segment J which gears with another wheel or toothed segment K upon the top carbon lever or arm F. A pawl F pivoted to a bracket F fixed on the framework E gears with teeth F upon the upper lever or arm F. The object of this is to prevent pumping or vibration of the said levers or arms. The said frame E also carries a socket L for fixing the apparatus upon a suitable Patented in England June 27, 1893,11'0. 18,115.

stand M when it is placed in working position and terminals N and N for connecting or joining the wires. The clamps or carbonholders G of the carbon levers or arms are made so that they can be turned to bring the carbons to any required angular position during the working by means of tilting levers X X.

The action is as follows: The current ontering the series coil or solenoid B attracts the central core 0 connected to lever G and the arc is struck. As the arc lengthens the current in said coil or solenoid diminishes. At the same time the current in the shunt coil or solenoid A increases, causing a pull on the core 0 and so shortens the arc. The joint action of the two coils or solenoids causes the carbons to approach. By means of the said tilting levers the carbons may be set for projecting purposes at any required angle and in any position during the working.

lVhat I claim is- 1. The combination, with a support E, a shunt coil A and a series coil B secured to the said support, a tubular spindle passing through the said coils, and a central core slidable in the said spindle; of the lower lever G pivoted to the said support and having its rear end operatively connected with the said core, the upper lever F also pivoted to the said support, and the toothed intergearing segments secured to the respective levers, substantially as and for the purpose set forth.

2. The combination, with the support E, a shunt coil A and a series coil B secured to the said support, a tubular spindle passing through the said coils, and a central core slidable in the said spindle; of the lower lever G pivoted to the said support and having its rear end operatively connected with the said core, the upper lever F also pivoted to the said support, a pawl pivotally connected with the said support and engaging with notches on the lever F, and the toothed intergearing segments secured to the respective levers, substantially as and for the purpose set forth.

3. The combination, with a support E, a shunt coil A and a series coil B secured to the said support, a tubular spindle passing through the said coils, and a central core slidable in the said spindle; of the lower lever G pivoted to the said support and having its rear end operatively connected with the said core, the upper lever F also pivoted to the said support, and the levers X and X pivoted to the ends of the levers F and G and provided with clamps for the carbons, substantially as and for the purpose set forth.

- F. J. BORLAND. 'itnesses:

HERBERT DUNN, J ABEZ BULLUs. 

